This late sixties/early seventies Occult Rock band featured a member named Oz Osborne, had a track called "Black Sabbath" that kicks off it's debut album and is credited with being the first band to ever use the devil horn hand gesture... and they are not called Black Sabbath. In fact, Coven's debut LP predates Sabbath's by a year and while not widely acknowledged, their influence stretches well beyond the Birmingham legends.
Spotify Playlist
https://open.spotify.com/playlist/2qkURdYib8hLz8s20D9yTC?si=1526168526854a62